Loaded signaling conductor



1 62 ,555 Aprll 5, 1927. J. G ROBERTS 3 LOADED SIGNALING CONDUCTOR FiledAug. 16. 1921 Wye/722w: 51/0/70 6-? Hake/f5,

Patented Apr. 5, 1927.

UNITED STATES PATENT OFFICE".

JOHN G. noEEn'rs, or nonns FERRY, :uEw YORK, assrenon "1'0 WESTERNELECTRIC comraNY, mconrona'rnn, on NEW YORK, n. Y., A conroae'rron onNEW JERSEY.

LOADED SIGNALING CONDUCTOR.

Application filed August 1 6,-1821. Serial No. 492,748.

This invention relates to loaded signaling conductors and particularlyto continuously loaded conductors suitablefor submarine cables.

5 An object ofthe invention is to provide a stranded signaling conductoron which the tral wire lsurrounded by six wires 2. The

" conductor ispreferably formed by stranding the outer'wires around thecentral wire 1.

Such a conductor has proven to be desirable in order that thecable maybe as flex- .ible as possible and thus reduce any tendency tobecome-disrupted either during the proc-, v ess of laying or while inactual use-.. Instead of employing a conductor like that shown in thedrawing, it may be desirable for part-icu lar purposes to employ otherwell known types of cable conduttors, such, for example,

ployed or one employing a core of insulating material. ,7 7 In a plyingcontinuous loading to this sort of a conductor when iron is used as theloadin material, the tape or wire is wrapped t ereabouts, touching thecomposite conductor atrelatively few points. Uponqthe submer'gence ofthe cable, the excesfiwires, causing strains and stresses to be set upin the magnetic. material. Such strains and stresses do not materiallyaffect the per meability of the iron; and for this reason the chan e inposition of the tape or wire is not 0 any great moment.

It has been found, however, that when material of high permeability atlow magchange of position seriously impairs its magnetic properties dueto the excessive strains and st set up therein. This invention providesa method of so positioning the load- .somewhat as regards temperaturesemployed as a structure in which no central core is em-' si'vewaterpressure forces the loading material into the interstices between theouter.

netizing forces is employed, such as for ex-- ample, certain alloys ofnickel and iron, this u ing material about the conductor that no changein position thereof relative to the conductor, results from thesubmergenceof the cable, thus preventing any impairment in thepermeability of the magnetic material.

In accordance with the invention, the magnetic tape or wire 3 isinitially compressed about the conductor, so that its inner surface issubstantially at all points in contact with. the conductor. This may beaccomplished in a variety of ways, the preferred method being to drawthe conductor after the loading material has been applied, through asuitable the which will force'the tape or wire into the intersticesbetween the outer wires. When this is done the contour of the magneticmaterial conforms to the contour of the conductor. The loading wire ortape is preferably well annealed before wrapping so that it will conformreadily to its new position when passed through the. die.

To develop the utmost permeability in the magnetic material-the loadedconductor may. be subjected to a heat treatment,;the treatment requiredin'any particular case varying and duration of heating and cooling. Theoptimum values of these variables may be readily determined in anyspecific case by experiment. After the heat treatment, the materialshould be guarded against any considerable str ains.

After the heat treatment, insulating material 4, such as gutta percha,is applied to the loaded conductor in accordance with the usual methodof. insulating submarine con- 00 ductors. Loading materials as referredto hereinbefore are described in the patent to- Elmen No. 1,586,884,granted June ,1, 1926.

What is claimed is 1. A signaling conductor having an uneven surface,and a layer of magnetic material wrapped spirally about the conductorand pressed into intimate mechanical contact therewith toconform to thesurface of the conductor. 1

,2. The method of l'oading asig'nalin' jcon ductor having a, pluralityvof cylindricah wires, which comprises wrapping the conductor helicallywit magnetic material and forcing said material into intimate contact105 with substantially the entire exterior surface of said 'conduc r. r

3. The method of loading a signaling conductor having a' plurality ofcylindrical wires, which comprises helically wrapping the conductor witha layer of loading material and shaping the loading material to con formto the contour of said conductor.

4. The method of applying a magnetic sheath to a stranded conductor,which comprises wrapping said conductor with a helical covering ofmagnetic tape, and compressing said magnetic tape into the crevicesbetween the strands of the conductor so that the magnetic sheathconforms to the contour of the conductor.

5. A signaling conductor comprising a plurality of wires strandedtogether and having a continuous stri of magnetic material wrappedhelically a out said conductor and compressed into the intersticesthereof.

In witness whereof, I hereunto subscribe my name. this 10th day ofAugust, A. D.,

JOHN G. ROBERTS.

